[4][5] Big Stone County lies on the western side of Minnesota.

The terrain of Big Stone County is low rolling hills, wooded or devoted to agriculture.

Its highest point is on its north line near the northwestern corner, 2.9 miles (4.7 km) east of Lagoona Beach, at 1,201 ft (366 m) ASL.

30.20% of all households were made up of individuals, and 16.90% had someone living alone who was 65 years of age or older.

Between 1928 and 2008, Big Stone County voted Democratic in every election except for two nationwide Republican landslides in 1952 and 1980.

The only other time between 1928 and 2000 that the Republican candidate lost by less than 10% was Ronald Reagan during his 1984 landslide reelection.

Despite favoring Barack Obama by over 6% in 2008, this would prove to be the most recent time Big Stone County would vote Democratic.

But in 2016, Donald Trump greatly expanded the thin margin Romney won the county by as Democratic candidate Hillary Clinton lost by nearly 25%, the first time a Republican won by more than 5% in the county since 1924.